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If it's any consolation I live bang in the middle of Zürich, and in my office at home I often get absolutely no connection with my Swisscom phone at all, but with my Coop phone, which is effectively Salt, I get a good signal.
It's never crossed my mind to complain to Swisscom because, having used mobile phones since 1990, I got used to blackspots, and I also know the difficulties that the mobile signals have in terms of penetrating buildings. If you're in a blackspot, like I am, then it's basically tough because you're not going to get a cell tower built just for you.
If I absolutely need data connection at home on my Swisscom phone, which is very rare, then I simply connect it to the home WiFi.
One thing I can suggest is that you pick up a swisscom PAYG sim and a sunrise PAYG sim and try them out to see if the connection is any better. You could then swap to a different network, and if absolutely necessary port your number across as well. Don't go by the respective coverage maps provided by the networks as they're often very optimistic, not detailed, and don't really take into account coverage in buildings.